Automatic telephone-switch.



No. 857.B6. PATENTED JUNE 25, 1907,

G: M. THOMPSON. AUTOMATIC TELEPHONE SWITCH.

APPLICATION FILED JAN. 25, 1907.

2 SHEETS-SHEET 1.

' PATENTED JUNE 25, 1907 C. M. THOMPSON. AUTOMATIOTELEPHONE SWITCH.

APPLICATION FILED JANZS. 1907.

2 SHEETSSHEET 2.

m llllllllll on o n? curios.

iriois, ASSIGNOR 'ro cnannns KY, CHIC ILLINOIS, A CORPORATION OF Patented June 25, 1907 Application iilcd January 25, 1907, Serial No. 354,005;

To a, who/:2 it in/5g; CC-HQOOIPRJ Be it known that l, Crim -inns M. Tnonr- I soN, a citizen of the united States, residing I at Chicago, in the county cl Cool; and State I use l'ul lmpro v einent in Au tom atic Tele phone- Switchcs, or" which the following is a full, 1 var, concise, and exact desc iption, reference br-in had to the aecompan 'ng drawings, lorming a part of this specification.

M3" im'eniion relates to switches for auio inaiic telepr exchanges. and especially to a form '1 rich embod nets for opera f local circuits at luodyin con/ta The object o sparking at Elie circuit, due to ifl magnets aui'l iiiprevent the new o'l'using nla-iimiin or other expensive corrosive mat: li'i'ircontarts in can 'ing' out my inve' ion, 1 rovide *itli two coils oi the same size or guetizing oower and connect thrse (oils xi-tn the re llllk ct, so that current lirst passed through one coil to ener no tl motor magnet. and then. passed i'lib. the l Uri coil in the opposite direc- Lion in iu-ui uthe first coil and thereby l dc cncrgiyzc (he :1 {Qllth 'ihus lib-1 dc-cnergizai'ion of. each motor magnet is aroma-l plislunl by neutralizing it instead ol' by lis- I comnuung cs 'zi-nt I there; yausmg mln'ect spark at the opening I of such circuit 'ihe circuits of both the en I I i I I l of illinois, have invented a rcrtain new and is to prevent of the local I I l l I I l l I I n ol the motor I each motor ma 'siet orgizing and neutralizing veils are simultaiiwrusly opened and as there is no magnetism in the magnet, the two coils neutralizing ear-b. other, 1 2L is no spark at the opi'ining ol their circuits. in the iiceompanying drawings, Figure 1 is a vfront view of an automatic switch of the Stronger type, having my improwd sparkprovcnting arrangement upon it; Fig. a side elevation of the same; 1S View sh n' lire relay nmgnets and motor in nets of {he swi an. together will: their in and circuil m "inoflions i'lia iici'ci'rizig lii shown compri: (-onsisiing cl 2 :uljuslablv i'nlz.

' Well known in the art.

and i co-operating with banks of contacts 5 and 6, so that the connections are made by the elevation and rotation of the shaft 2. The usual vertical magnet 7 is shown cooperating with an, armature 8 and elevating mechanism which is arranged to elevate the shaft 2 in a st ep-by stcp manner, butwliich willnot be described in detail here as it forms no part of my. present inventionand is The rotary magnet J is also shown co'operating with an armature 6 5 10 which co-operates with mechanism for rotttiIlQ the shaft 2, which mechanism, however, Will not be descrlbed here as 1t forms no part oi" my present invention and is Well i The vertical relay 1s known in. the art. shown at 11 and the rotary rela at 12. These rjlays' are provided with arm tures 13 respectively carrying downwardly oxten ling arms 15 and 16.

each of the motor magnets,that is thevertical magnet 7 and rotary magnet 8,.are

' provided with two coils which are of the same magnetizing. power, as for example being constructed with the same number of turns are of the same magnetizing power or magarctic inductive capacity, they will neutralize one another when they are both energized with the same sized current. The coil 17 of the vertical magnet 7 is employed as the magnetizing coil, and to such end is connect- 9O ed with a contact strip 18 adjacent to the verlicai relay 11, by a conductor 19. The other terminal of this coil is connected by a conductor 20 to the battery and other parts of the switch, and is thence connected back to a middle contact strip 21 between the relays I1 and 12, so that by making Contact, between the strips 18 and 21, the circuit will be closed through the coil 17 and the magnet 7 energized. 7 is connected by means of a conductor 23 with a contact strip 24 secured in position below the relays 11 and 12 and the other terninal of this coil is connected by a conductor rgiiiing coil 17 is connected. The connecion then runs back through a conductor 26 o another contact strip 27 alongside of the Referring now to Fig. 3, it Will oe seen that 7 5 The other coil 22 of the magnet 60 5 nth the same battery with which the en- 1 5 contact strip 24. The contact strip 18 and the strips 24 and 27 have their ends close together, and the lower end of the strip 18 is adapted 'to be actuated by an insulating roller 28 on the armature arm 15, so that the contact strip 18 will first make connection with the strip 21 and then at a later instant the strip 27 will be caused to contact with the strip 24. The circuit will therefore be closed first through'the energizing coil 17, through the contacts 18 and 21, as a result of which the vertical magnet 7 will be energized.

Then the circuit will be closed through the supplementary coil 22 by the contacts 24 and 27, so that the vertical magnet will be neutralized and thereby de-energized. The armature will then return to its original posi tion, releasing all of the contacts at practically the same-instant, as a result of which the circuits of both coils will be opened simultaneously, and as they neutralize one another there is no magnetization of the magnet and no self induction and nospark at break.

The arrangement for the rotary magnet 8 is substantially the same. Its main or.ener' gizing coil 30 is connected by a tonductor 31 with a contact strip 32 and the other terminal of the coil is connected by a contact'33 to tralizing coil is closed by contacts 36 and 39v battery and other parts of the switch. The other coil 34 of the magnet 8 is connected by a conductor 35 with a'contact strip 36 and its otherside by a conductor 37 to main battery and thence back by a conductor 38 to a con tactstrip 39 alongside of the contactstrip 2 1. The contact strip 32 is operated by an insulating roller 28 on the armature arm 16 the same as with the other 1nagnet, so that the circuit is first closed through the main or en ergizing coil 30 by means of contact strips 21 and 32 and then the supplemental 0rneu- The circuits or the contacts operated, thereby, and circuit connections between the motor magnet and relay, whereby the relay by one and the same actuation closes the circuit iirst through one winding and then through the other. f

2. In an automatic telephone switch, the combination of a motor magnet having two windings and an electromagnetic device combined with means [or closing the'circuit through both of said windings one after the other by a single operationoi said device 3. The combination of a motor magnet having two windings of the same or substan tially the same inductive capacity, oi a relay having an armature, and two sets of contacts controlled by said armature, one set oi contacts being to close the circuit through one of said windings iirst, and the other set of contacts being to close the circuit through the other winding at a later time and the two setsoi' contacts being arranged to be operated to close said windings upon the same stroke of the armature.

4. The combination oi a motor magnet having-two opposing windings, a relay having an armature, contacts coi'itrolled by said relay and arranged to be closed one after the other by the same movement of the relay armature, and telephone switch mechanism actuated by said motor magnet. 4

5. The combinationof vertical and rotary "magnets, of an automatic telephone switch,

each ofsaid magnets having two opposing windings of substantially the same magnetic inductive capacity,telepl LOliO switching mechanism controlled by saidmagnets, relays combined with contacts, and circuit comicctions for closing the cireuits through said magnets, each of said relays being provided with two sets of contacts for the two windings of the correspondii'ig motor magnet and said contacts being arranged so that the windings oi the magnet are closed one after the other by one and the same actuation. oi? the corresponding relay.

In witness whereof, I hereunto subscribe my name this 19th day oi January, A. D.

' GHARL CS M. THOMPSQlJ. Witnesses:

.J. DAMIEN CANNE,

Jonn Pt.-Pnnn1Ne-ron 

